(b) Collateral—(1) Rules of recognition. A Board-regulated institution may recognize financial collateral in determining the Board-regulated institution's risk-weighted asset amount for a securitization exposure (other than a repo-style transaction, an eligible margin loan, or an OTC derivative contract for which the Board-regulated institution has reflected collateral in its determination of exposure amount under § 217.132) as follows. The Board-regulated institution's risk-weighted asset amount for the collateralized securitization exposure is equal to the risk-weighted asset amount for the securitization exposure as calculated under the SSFA in § 217.144 or under the SFA in § 217.143 multiplied by the ratio of adjusted exposure amount (SE*) to original exposure amount (SE),

Where:

1. (i) SE* = max {0, [SE−C × (1−Hs−Hfx)]};
2. (ii) SE = the amount of the securitization exposure calculated under § 217.142(e);
3. (iii) C = the current fair value of the collateral;
4. (iv) Hs = the haircut appropriate to the collateral type; and

5. (v) Hfx = the haircut appropriate for any currency mismatch between the collateral and the exposure.

   

6. (3) Standard supervisory haircuts. Unless a Board-regulated institution qualifies for use of and uses own-estimates haircuts in paragraph (b)(4) of this section:

   1. (i) A Board-regulated institution must use the collateral type haircuts (Hs) in Table 1 to § 217.132 of this subpart;
   2. (ii) A Board-regulated institution must use a currency mismatch haircut (Hfx) of 8 percent if the exposure and the collateral are denominated in different currencies;
   3. (iii) A Board-regulated institution must multiply the supervisory haircuts obtained in paragraphs (b)(3)(i) and (ii) of this section by the square root of 6.5 (which equals 2.549510); and
   4. (iv) A Board-regulated institution must adjust the supervisory haircuts upward on the basis of a holding period longer than 65 business days where and as appropriate to take into account the illiquidity of the collateral.
7. (4) Own estimates for haircuts. With the prior written approval of the Board, a Board-regulated institution may calculate haircuts using its own internal estimates of market price volatility and foreign exchange volatility, subject to § 217.132(b)(2)(iii). The minimum holding period (TM) for securitization exposures is 65 business days.

(2) ECL for securitization exposures. When a Board-regulated institution recognizes an eligible guarantee or eligible credit derivative provided by an eligible guarantor in determining the Board-regulated institution's risk-weighted asset amount for a securitization exposure, the Board-regulated institution must also:

1. (i) Calculate ECL for the protected portion of the exposure using the same risk parameters that it uses for calculating the risk-weighted asset amount of the exposure as described in paragraph (c)(3) of this section; and
2. (ii) Add the exposure's ECL to the Board-regulated institution's total ECL.

(3) Rules of recognition. A Board-regulated institution may recognize an eligible guarantee or eligible credit derivative provided by an eligible guarantor in determining the Board-regulated institution's risk-weighted asset amount for the securitization exposure as follows:

1. (i) Full coverage. If the protection amount of the eligible guarantee or eligible credit derivative equals or exceeds the amount of the securitization exposure, the Board-regulated institution may set the risk-weighted asset amount for the securitization exposure equal to the risk-weighted asset amount for a direct exposure to the eligible guarantor (as determined in the wholesale risk weight function described in § 217.131), using the Board-regulated institution's PD for the guarantor, the Board-regulated institution's LGD for the guarantee or credit derivative, and an EAD equal to the amount of the securitization exposure (as determined in § 217.142(e)).

2. (ii) Partial coverage. If the protection amount of the eligible guarantee or eligible credit derivative is less than the amount of the securitization exposure, the Board-regulated institution may set the risk-weighted asset amount for the securitization exposure equal to the sum of:

   1. (A) Covered portion. The risk-weighted asset amount for a direct exposure to the eligible guarantor (as determined in the wholesale risk weight function described in § 217.131), using the Board-regulated institution's PD for the guarantor, the Board-regulated institution's LGD for the guarantee or credit derivative, and an EAD equal to the protection amount of the credit risk mitigant; and

   2. (B) Uncovered portion. (1) 1.0 minus the ratio of the protection amount of the eligible guarantee or eligible credit derivative to the amount of the securitization exposure); multiplied by

      (2) The risk-weighted asset amount for the securitization exposure without the credit risk mitigant (as determined in §§ 217.142 through 146).